Raquel Mendonca; Roger A. Muller; David Clow; et al.
Burial in sediments removes organic carbon (OC) from the
short-term biosphere-atmosphere carbon (C) cycle, and therefore prevents
greenhouse gas production in natural systems. Although OC burial in lakes and
reservoirs is faster than in the ocean, the magnitude of inland water OC burial
is not well constrained. Here we generate the first global-scale and regionally
resolved estimate of modern OC burial in lakes and reservoirs, deriving from a
comprehensive compilation of literature data. We coupled statistical models to
inland water area inventories to estimate a yearly OC burial of 0.15 (range,
0.06.0.25) Pg C, of which ~40% is stored in reservoirs. Relatively higher OC
burial rates are predicted for warm and dry regions. While we report lower
burial than previously estimated, lake and reservoir OC burial corresponded to
~20% of their C emissions, making them an important C sink that is likely to
increase with eutrophication and river damming.
(来源:Nature Communications, 2017,
doi:10.1038/s41467-017-01789-6)
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